THERMODYNAMIC PARAMETERS OF LIQUID GOLD-ALUMINUM ALLOYS

Thermodynamic activities and, enthalpies for Au-Al alloys have been measured by Knudsen-cell mass spectrometry, independently using closely similar techniques in laboratories in Vienna and Strathclyde. The results are consistent and indicate, for Au rich alloys, gold activities with positive deviations from Raoult ideality. This is in disagreement with EMF measurements of Au activity previously reported; the results also indicate endothermicities (of ∼ 38 kJ/mol at x Al ∼ 0.5) that are some 5 to 6 kJ/mol larger than those indicated by the EMF measurements. © 1979 The Metallurgical of Society of AIME.